(CNSNews.com) – Former Massachusetts Gov. Mitt Romney, a top GOP presidential contender, complained of Fox News being “overly aggressive” and asking “uncalled for” questions during an interview, according to Fox News Special Report anchor Brett Baier.

Baier asked Romney about the Massachusetts health care legislation that is similar to the federal health care law enacted in 2010 signed by President Barack Obama. The laws have been called Romneycare and Obamacare respectively.

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The Democratic National Committee has run online ads on Romney, who has been first or second in polls since entering the race, while other Republican candidates have criticized Romney for the policy.

Baier asked Romney about Romneycare, “Do you believe that that was the right thing for Massachusetts. Do you think a mandate -- mandating people to buy insurance is the right tool?”

Romney responded, “Bret, I don't know how many hundred times I have said this, too. This is an unusual interview. All right. Let's do it again. Absolutely what we did in Massachusetts was right for Massachusetts. I have said that time and time again. The people of the state continue to support it by about three to one. But it's also designed for Massachusetts, not for the nation.”

On the O’Reilly Factor Wednesday, host Bill O’Reilly asked, “How do you know he was irritated? Did he slap you? Or what did he do?”

Baier answered, “He said he thought it was overly aggressive.”

O’Reilly clarified, “He did, he said that to you? He said it was overly aggressive?”

Baier answered, “He did,” and continued, “And as we were walking in the walk and talk and then after he finished he went to his holding room and then came back and said he didn’t like the interview and thought it was uncalled for.”

O’Reilly later said, “He thinks that you played a gotcha game. I think that's what I'm getting out of this that you would to get -- you know, said, well you said this in 2006. You said this in -- it was kind of a gotcha. Can I get him, can I catch him on anything.”

Baier responded, “But that's really not what I was trying to do, Bill. I was trying to address the issues that are happening right now. He's under attack. If you look at any analyst they'll say his biggest vulnerability is what he said back then and what he is saying now. And I was giving him the opportunity to address that head on.”